thanks for the link. I've read some about this carb, as far as the mixture screws, I must not have the original metering block because turning the screws in will kill the motor. once I start it today I'll try to lean it out a bit with the mixture screws. I've tried adjusting the screws with a vac gage and the tach, always end up at 1 1/2 - 1 3/4 out for highest idle. Need to find some zinc additive before I start it, ran out of the comp cams additive I've been using.

Originally Posted by fast68plymouth
Okay...... we may be getting somewhere.......

If what’s said in this thread is true....... then some serious reworking of the low speed circuits would have had to be done for this application......
https://www.forbbodiesonly.com/moparforum/threads/pic-request-1971-383hp-with-factory-holley.97491/